I upgraded two computers. I originally bought Parallels over a year ago directly from Parallels. I bought another copy, for my MacBook, a few weeks ago from the Irish Apple Store. I received the please upgrade email and bought two upgrades. Upgrading the MacBook installation did not work as the licence key I got with the boxed edition of Parallels was deemed inappropriate. Why are there different licence key systems??? "Let's use more than one licence key system! It will annoy the customers to no end! Muahahahaha!" Get the freaking evil managers out of the company!!! Seriously, whoever came up with that brilliant idea is a major reason for why Parallels loses customers at the moment. I hope whatever benefit Parallels gets from this system is worth it! Now, I used my original licence key to upgrade my MacBook. Oddly enough my second upgrade licence key was accepted without the need for the original key by my iMac installation. The Linux mouse sync works. No problems with Windows, except Parallels tools installation takes too long and the progress bar simply doesn't indicate how long it will take. OS/2 stopped working. It still runs but the mouse doesn't work and OS/2 refuses to load the mouse driver now. The OS/2 VM also refuses to mount vmtools.iso, claiming that it cannot find the file/device. My OS/2 installation did work before the update.